As a Shopware developer, your main work will be to develop extensions that enhance or modify the functionality of Shopware in a specific way. Shopware offers different types of extensions, each with its own benefits and implications. To make sure you don't get lost in all the options, look at the next overview article which compares the approaches.
Alternatively, if you want to dive straight in, take a look at our introduction guides:
{% page-ref page="plugins/plugin-base-guide.md" %}
{% page-ref page="apps/app-base-guide.md" %}
{% page-ref page="themes/theme-base-guide.md" %}